Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdf21664df620d7…

MALICIOUS

PDF

88.6 KB Created: 2021-09-19 19:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72d1f50df57c85dfc940276e7a7afe6b SHA-1: 3e0f36b73911ab85a39990b46ec59171537d52d0 SHA-256: 4bdf21664df620d700dae829130c46bcd606723256ca47532434e3834d6d6ee9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to unknown domains, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of numerous links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://mini-garden.ru/userfiles/file/lelopegatopo.pdf In PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/48079088486.pdfIn PDF document text
    • http://pronobile.de/catalog/file/jakusuxurobuto.pdfIn PDF document text
    • https://clinicscrm.com/img/files/53512809714.pdfIn PDF document text
    • https://salonrewards.ca/images/file/rawisop.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/56192780897.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/96064393698.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138896be1a9a---vuxatufusa.pdfIn PDF document text
    • https://halkum.rs/files/nexegedegemosajulivum.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/1d504ec5e7ee9387ae408c7886085d3b/45172485050.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/bedur.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/6703827547.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/kufasofafugugipowix.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/zipotezolusironemezuzezu.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/13822522543.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/nixuwedagafudi.pdfIn PDF document text
    • https://majubesar.org/contents/files/mazaguxumipatixilaxug.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/bixopiwumelavusosenarire.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/80997789369.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/rudamej.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/80901304020.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/8267401946.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/vikip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=facebook+chat+head+not+workingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 19344 bytes
SHA-256: 226d418b5930266f6af1603111f9ed28363f17c79259f43f0b0b82f882227ee5
font_01_sfnt_off00012450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C67 10728 bytes
SHA-256: 47a9fb3c466567eae122f807e696dd1d40c3af0f22f7c694045a498d736c9b44